6553600

Appears in sequences

• Negated coefficients of Chebyshev T polynomials: [x^n](-T(n+6, x)), n >= 0.at n=14A001794
• Norm of a matrix.at n=10A004141
• First differences of A045623.at n=21A045891
• a(n) = 2^(n-1)*(3*n-4).at n=18A053565
• Denominators of coefficients of 1/2^(2n+1) in Newton's series for Pi.at n=12A054388
• Denominators of series related to triangular cacti.at n=10A058928
• Coefficients of (-x^(2n-6)) in Chebyshev polynomial of degree 2n.at n=7A068548
• 20-almost primes (generalization of semiprimes).at n=11A069281
• Smallest number beginning with 6 and having exactly n prime divisors counted with multiplicity.at n=19A106426
• Denominators of partial alternating sums of Catalan numbers scaled by powers of 1/(5*8^2) = 1/320.at n=3A121011
• Denominators of expansion of exp(1-sqrt(1-3*x)).at n=10A144526
• Number of binary strings of length n with equal numbers of 0001 and 1000 substrings.at n=23A164161
• Expansion of (1+8x^2+8x^3)/((1-2x)^2*(1+2x+4x^2)).at n=18A168057
• Numbers k such that the sum of digits of k equals the concatenation of the distinct prime divisors of k.at n=8A212667
• Numbers m for which sum of divisors of sum of divisors of m is a power of 2.at n=20A275674
• Decimal representation of the diagonal from the corner to the origin of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 158", based on the 5-celled von Neumann neighborhood.at n=44A286122
• Squares that can be expressed as the sum of two positive squares but not as the sum of three positive squares.at n=9A309779
• Triangle read by rows: T(n,k) is the number of k-colored graphs on n nodes with restricted labels, n>=0, 0<=k<=n.at n=33A335330
• a(n) is the least number with exactly n divisors of the form 3*k+1.at n=28A364582
• Numbers that decrease two times in succession when they are iteratively replaced by the "Look and Say" description (cf. A045918) of their prime factors, counted with multiplicity.at n=21A379455